Outside of isolated coins, that's pretty much how it has played out. It's been around a 7-8 month alt bear market compared to btc. And around 2 years of an overall bear market.
I wouldn't expect a new altcoin season to happen anytime soon, but this last btc rise was a little different than recent ones. At least this time alts didn't completely crumble when btc did its hike thing, like it did all summer. Alts recovered at least somewhat, some actually outpaced btc.
So if we pretend alts already hit their bottoms, it may play out similar to 17-18 in regard to btc-alt ratios. BTC goes up, alts sink, alts slowly regain and chugs along with btc. Now that means over time they will rise too, some a little higher than btc, some a bit lower, but at least they keep pace more or less. That's what happened in 17-18, then alts did the crazy thing after btc hit its ath. I don't expect the crazy altcoin season to occur again, but so long as alts keep pace, it could still prove to be profitable.
For pure junk coins I wouldn't expect them to keep pace at all, top 100 or so coins, maybe. We'll see. It's been pretty difficult to get a read on the market.